/*
 * Hibiscus is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published
 * by the Free Software Foundation; either version 3 of the License,
 * or (at your option) any later version.
 *
 * Hibiscus is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Hibiscus; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA
 *
 * Copyright (C) 2003 Tetete - http://tetete.hu.
 */
package hu.tetete.hibiscus.util;

import hu.tetete.hibiscus.expression.Expression;
import android.util.Log;

import com.thoughtworks.xstream.XStream;

/**
 * Utility class to handle expressions.
 */
public final class ExpressionUtil {

    /** Logger's tag. */
    private static final String TAG = ExpressionUtil.class.getName();

    private static XStream getConfiguredXStream() {
        return new XStream();
    }

    /**
     * Serializes an expression using xml serialization.
     * TODO implement me!
     * @param expression The expression to serialize
     * @return The xml containing the serilaizedd expression.
     */
    public static String serializeExpression(final Expression expression) {
        final XStream xstream = getConfiguredXStream();
        final String expressionString = xstream.toXML(expression);
        Log.d(TAG, "Serialized expression: ExpressionString: " + expressionString);
        return expressionString;
    }

    /**
     * Deserializes an expression.
     * TODO implement me!
     * @param expressionString The xml containing the serialized expression
     * @return The expression.
     */
    public static Expression deserializeExpression(final String expressionString) {
        if (expressionString == null || expressionString.length() == 0) {
            return null;
        }
        final XStream xstream = getConfiguredXStream();
        final Expression expression = (Expression)xstream.fromXML(expressionString);
        Log.d(TAG, "DeSerialized expression: Expression: " + expression + "ExpressionString: " + expressionString);
        return expression;
    }

    /**
     * Private constructor to avoid the instantiation.
     */
    private ExpressionUtil() {
        /* NOP */
    }

}
